Joyent Blog Page 2

Recently on the ZFS mailing list http://wiki.illumos.org/display/illumos/illumos+Mailing+Lists, there was some discussion about how ZFS distributes data across disks. I thought I might show some work I've done to better understand this.

Carlos Cardenas has been working on porting a program from Linux that is CPU bound. He found some hotspots using DTrace. He asked someone what else he could do to maximize performance and was asked in turn if the program was cache friendly. Carlos went on to ask if I could provide some insight into the cpc provider in DTrace. I'll do that, concentrating on examining cache utilization.

For the past few weeks, I have been studying performance of an application that uses MongoDB, Node.js, and jmeter. The application was written by a third party, and they set up the application so that each component runs in its own Smart Machine.

I have been thinking about this one for a while, because every now and again, mostly for testing purposes I find that I really wish I could reset a kstat. I have been able to figure out how to reset certain kstat(s) with MDB, but wondering if perhaps you have one method that makes it relatively easy to find and reset any kstat.

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